42644138 has 16 divisors (see below), whose sum is σ = 65331360. Its totient is φ = 20870256.

The previous prime is 42644137. The next prime is 42644153. The reversal of 42644138 is 83144624.

It is not an unprimeable number, because it can be changed into a prime (42644137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32756 + ... + 34032.

It is an arithmetic number, because the mean of its divisors is an integer number (4083210).

Almost surely, 2^42644138 is an apocalyptic number.

42644138 is a deficient number, since it is larger than the sum of its proper divisors (22687222).

42644138 is a wasteful number, since it uses less digits than its factorization.

42644138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its digits is 18432, while the sum is 32.

The square root of 42644138 is about 6530.2479279121. The cubic root of 42644138 is about 349.3706731820.

The spelling of 42644138 in words is "forty-two million, six hundred forty-four thousand, one hundred thirty-eight".